Mounting your Mark 4 on any weapon is easy and secure thanks to the Leupold Mark 4 Rings Super High / High / Medium Matte Black. With an improved tolerance and unmatched strength thanks to the cross-slot design, these Riflescope Rings manufactured by Leupold feature the slot and spline creation that is adaptable for any firearm, with 8-40 adaptable capabilities for times when 6-48 screws will not do. Simply mount the Leupold Mark 4 Mounting Rings on any Leupold PRW bases or any other Picatinny-style rails and you're ready to use your favorite optic. The steel craftsmanship offers the reliable strength you demand when you're shooting with the Leupold Mark 4 Rings Details - Accepts 1.18in/30mm Maintubes - High Height: 1.06 in/26.9 mm - Mount to Picatinny-Style Rails - Aluminum Construction - Made in the USA.